珠江隧道沉管管节制作中裂缝原因分析与治理

广州珠江隧道是我国首次采用沉管法施工的长达１２６７ｍ的大型过江隧道，为使隧道达到抗渗的设计要求，管节预制时裂缝的防治是关键的一个环节。本文主要介绍Ｅ１管节在干坞内制作中产生的裂缝，根据裂缝的部位和形状，对管节裂缝的原因作了详细分析。

ANALYSIS AND TREATMENT OF CRACKS IN PREFABRICAMNG THE'PEARL RIVER'TUNNEL TUBES

The Guangzhou 'Pearl River' tunnel is the huge-type through-river tunnel.In China the tubes are first applied in tunnel, which is 1267m in length. The key steplies in the prevention from the cracks during the prefabrication of tubes, so that thetunnel can meet the needs for the impervious design. The cracks produced during thefabrication of tunnel E1 on the dry dock site are fully described in the paper.The causeof tube cracks are thoroughly studied, on the base of cracks location and patterns.By minibusing the construction length of concrete casting and controlling the temperatures, the cracks have been efficiently controlled in other tubes. To have impervioustest, morethan 20 hours water should be kept, located in the dry dock, resulted inno seepage. The tUnnel tubes are successfully prefabricated for the first time and havebetter impervious effect as well.